Database Programming Languages: 8th International Workshop, by Dan Suciu (auth.), Giorgio Ghelli, Gösta Grahne (eds.)

By Dan Suciu (auth.), Giorgio Ghelli, Gösta Grahne (eds.)

This ebook constitutes the completely refereed post-proceedings of the eighth foreign Workshop on Database Programming Languages, DBPL 2001, held in Frascati, Italy, in September 2001.
The 18 revised complete papers provided including an invited paper have been rigorously chosen in the course of rounds of reviewing and revision. The papers are prepared in topical sections on semistructured info; OLAP and knowledge mining; structures, schema integration, and index concurrency; XML; spatial databases; person languages; and principles.

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Extra info for Database Programming Languages: 8th International Workshop, DBPL 2001 Frascati, Italy, September 8–10, 2001 Revised Papers

Example text

Xn ) ← A1 , . . R2 | (R1 |R2 ) (2) ∗ where l ranges over labels in L and means any (single) label. Of course, each distinguished variables xj must also occur in the right hand side. As indicated, we follow [13] in using the shorthand ∗ for ∗ . If B is a semistructured database, an atom x R y is satisfied by a valuation that maps x, y to nodes s, t in B if there is a path from s to t in B which spells out a word in the language denoted by the regular expression R. We extend this definition of atom satisfaction to give semantics to whole CRPQs in the way that is usual for conjunctive queries.

In section 3 we summarize our results and discuss some related work. Section 4 contains our results on upper bounds for pure query containment while section 5 contains the corresponding lower bound results. ) containment of queries in the presence of dependencies. Section 7 extends the chase & backchase technique [9] to two of the fragments we study. We conclude in section 8. Due to space limitations, we have relegated some proofs and a worked example to the full paper [11], which also contains the extension to unions and disjunction of the chase.

Haruo Hosoya and Benjamin C. Pierce. Regular expression pattern matching for xml. In ACM SIGPLAN, SIGACT Symposium on Principles of Programming Languages (POPL), pages 67–80, January 2001. John C. Mitchell. Foundations for Programmng Languages. MIT Press, 1996. T. Milo, D. Suciu, and V. Vianu. Typechecking for XML transformers. In Proceedings of the ACM Symposium on Principles of Database Systems, pages 11–22, Dallas, TX, 2000. Makoto Murata. Transformation of documents and schemas by patterns and contextual conditions.

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